One of the reasons why people love 4×4 Off Road vehicles, also known as Four-Wheel-Drive vehicles or simply put, 4WD is because of traction. The reason why people are able to do the things they do with these vehicles is because of traction or grip. Basically, traction originates from the engine and through a transmission system, it reaches the four wheels of the car. Through this system, one is able to drive both the front and the rear axles. As the wheels will be turning, they will have traction. If you have a 2WD vehicle, it means that only 2 of your front wheels will have traction; the rear wheels will not.
So, let’s say you find yourself in a muddy situation and you do not have a 4WD vehicle. Your front wheels will be hard on the ground and not spinning as you will be trying to get the vehicle out of the mud. But the rear wheels will be spinning continuously because they cannot gain any traction. This makes it harder to get out of the muddy situation. Something which would be very easy with an off-road vehicle.